Do bug zappers work?

Insect electrocution devices are sold in huge quantities for use to attract and kill thousands of insects over a 24 hour period. Two controlled studies conducted showed that mosquitoes comprised on 4.1% and 6.4% of the daily catch over an entire mosquito season. More importantly is that there was no significant difference in the number of mosquitoes found in yards with or without these devices. Many of the other insects killed in the trap were beneficial predators that feed on other insects. What is most disturbing is the number of non-pest insects that were killed which constitute a majority of the songbird’s diet. There is strong evidence that mosquitoes continue to be more attracted to humans than these electronic devices.